You are obviously very artistic as these pictures show a beautiful AP system. If you're ever coming to Portland let me know and I will contact you if I'm up your way.
Thank you very much Linda! I will absolutely let you know :-)
Impressive setup. I might redo mine. As to your questions, based on the size of your beds you may not need a timer. The beds aren't deep and the media will take up about 60% of the space. As long as there's ample water in the pond you shouldn't have a problem. Even if the pond rises and lowers 50% max you should be fine.